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The Rock Island F-7s have a distinct cooling assembly mounted on top of their cabs. This assembly is a model of that detail. The pipes are approximately 0.02" in diameter (N-scale), and two holes will need to be drilled into the roof of the cab to hold the assembly. The feet can than be glued directly to the cab top. Available in O (1:48), HO (1:87) and N (1:160).